Limiting efficiency of silicon solar cells

@article{Tiedje1984LimitingEO,
  title={Limiting efficiency of silicon solar cells},
  author={Thomas Tiedje and Eli Yablonovitch and George D. Cody and B. G. Brooks},
  journal={IEEE Transactions on Electron Devices},
  year={1984},
  volume={31},
  pages={711-716}
}
The detailed balance method for calculating the radiative recombination limit to the performance of solar cells has been extended to include free carrier absorption and Auger recombination in addition to radiative losses. This method has been applied to crystalline silicon solar cells where the limiting efficiency is found to be 29.8 percent under AM1.5, based on the measured optical absorption spectrum and published values of the Auger and free carrier absorption coefficients. The silicon is… 

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TLDR
The theoretical upper limit for solar cell conversion efficiency can be raised if photon absorption and electron-hole excitation follow a specific pathway that includes photon absorption at specific points in the Brillouin zone, and an inverse Auger effect mechanism for the multiplication of electron- hole pairs.
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